javascript - 如何在 JavaScript 中输入不相同或为空时返回 False

Question

当密码和确认密码不相同或当密码为空。

这是我的尝试。

<div class="card margin-card-password">
    <div class="card-header">Change Password</div>
        <div class="card-body">
        <form id="change_password" name="change_password" method="get" action="action/save.php">
            <div class="col-sm-6">
            <div class="form-group">
            <label for="New Password">New Password</label>
            <input type="password" class="form-control" id="password" name="password" value="">
            </div>
            <div class="form-group">
            <label for="Confirm Password">Confirm Password</label>
            <input type="password" class="form-control" id="confirm_password" value="">
            </div>
            </div>
            <div class="col-sm-10">
            <button type="submit" class="btn btn-primary" id="change_password" name="change_password">Save</button>
            </div>
        </form>
    </div>
</div>

js

<script type="text/javascript">
   $('#change_password').on('click', function(){
       var password = $.trim($("#password").val());
       var confirmpassword = $.trim($("#confirm_password").val());
       if(password != confirmpassword) || (password.includes ("")){
           alert('The Password is Doesnt Same!');
           return false;
        }
    });
</script>

Answer 1

密码.includes ("")这部分代码检查密码是否包含 ""- 空字符串。每个字符串 包含 空字符串。您需要检查字符串 是否 是像这样的空字符串 - password == ""。

希望对你有帮助

  $('#change_password').on('click', function(){
       var password = $.trim($("#password").val());
       var confirmpassword = $.trim($("#confirm_password").val());
       if(password != confirmpassword || password == ""){
           alert('The Password is Doesnt Same!');
           return false;
       }
    });

还有这个

$('#change_password').on('click', function(){
    var password = $.trim($("#password").val());
    var confirmpassword = $.trim($("#confirm_password").val());
    if(password != confirmpassword){
        alert('The Password is Doesnt Same!');
        return false;
    }else if(password == ""){
        alert('The Password is empty!');
        return false;
    }
});

附言对不起英语不好